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Lower Unit Noise: Bearings, Gears, or Something Else? If your outboard is making unusual noise, especially from the lower unit, it is not something to ignore. What starts as a small sound can quickly turn into a major repair if left unchecked. The key is understanding what the noise might be telling you. Grinding or Growling Noise A grinding or deep growling sound is one of the most serious warning signs. This is often related to worn or failing bearings or internal gear damage. Common causes: …

The lower unit, sometimes called the gearcase, is one of the hardest-working parts of an outboard engine. It transfers power from the engine to the propeller and handles constant exposure to water, impact, and debris. Even though it sits underwater, it plays a huge role in your boat’s overall performance and reliability. What Does a Lower Unit Do? The lower unit contains the gears, bearings, seals, and shafts that transfer engine power to the propeller. It is responsible for: Forward and …